A multi-stage reverse osmosis process and system with adjustable desalination rate
A technology of reverse osmosis and desalination rate, applied in the field of multi-stage reverse osmosis process and system, which can solve the problems of inability to recover hydraulic pressure, limited maximum concentration capacity, and inability to precisely control desalination rate, and achieve the effect of reducing energy consumption
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Embodiment 1
[0053] like figure 1 As shown, a multi-stage reverse osmosis process with adjustable desalination rate includes the following steps:
[0054] S1: According to the concentration ratio required by the wastewater, the number of stages of the reverse osmosis module is calculated as n stages;
[0055] S2: Taking the process energy consumption as the objective function, calculate the target desalination rate of each stage of reverse osmosis modules starting from the second stage reverse osmosis module, so that the process energy consumption is the lowest;
[0056] S3: Process each stage of reverse osmosis components starting from the second-stage reverse osmosis component according to the desalination rate described in step S2, so as to adjust the desalination rate of each stage of reverse osmosis components starting from the second-stage reverse osmosis component to achieve the target desalination Rate;
[0057] S4: Filter the feed wastewater, the i-th (1≤i≤n) reverse osmosis com...
Embodiment 2
[0088] like figure 2 As shown in the figure, a multi-stage reverse osmosis system with adjustable desalination rate includes a discharge pipe, a water storage tank, an energy recovery device, n (n≥2) stages of reverse osmosis components, n feed pipes, (n-1) The reverse osmosis components of n stages are connected in sequence. Each stage of reverse osmosis components is provided with a feed port, a discharge port and a water outlet. The i-th (1≤i≤n) stage reverse osmosis assembly The connection relationship of the penetration components is as follows:
[0089] When i=1, the i-th feed pipe is connected to the feed port of the i-th reverse osmosis module, the i-th pressurizing pump is set in the i-th feed pipe, and the water outlet of the i-th reverse osmosis module is connected to the The water storage tank is connected, and the discharge port of the i-th reverse osmosis component is connected with the (i+1)th feed pipe;
[0090] When 1
Embodiment 3
[0094] During the production process of the factory, a wastewater with a salinity of 1% was produced. Now it is necessary to concentrate and reduce the salinity of the wastewater to 8%. After calculation, under the hydraulic pressure of 80bar, a two-stage reverse osmosis with adjustable desalination rate is adopted. The process and system treat wastewater with a salinity of 1%, such as image 3As shown, the salinity of the concentrated wastewater can reach the target, while the process energy consumption is the lowest, which is 2.5kWh / m 3 , wherein, the second-stage reverse osmosis module was soaked with 5400ppm pH=7 NaClO solution, and then transferred to 0.1M NaOH solution for soaking, and the desalination rate of the second-stage reverse osmosis module was precisely adjusted to 34%. Since the salt retention rate of the second-stage reverse osmosis module is only 34%, the concentration of the product water of the second-stage reverse osmosis module is 66% of the salinity of ...
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